Seco-Larm SK-1011-SQ Indoor Access Control Keypad, 100 Unique 4~8 Digit Codes, One Output: Form C Relay Output (5A@28VDC), Stainless-steel Ffaceplate, Easily Delete Individual Codes 100 Unique 4~8 digit codes, One output: Form C relay output (5A@28VDC) Stainless-steel faceplate, Easily delete individual codes, Programmable wrong-code lockout Programmable output relay activation buzzer, Relay output inhibit control Auto or manual-code entry checking, Egress input, Built-in tamper (N.C.) circuit EEPROM memory: Prevents data loss, Power: 12~24 VAC/VDC, Backbox included